Electric cloth-cutting machine.



N. KOMOW.

ELECTBIC CL'OTH CUTTING MACHINE. APPLICATION FILED MAY 3, 1912.

Patented Apr. 4,1916.

2 SHEETSSHEET I.

c, m we nfoz Q vi/tmeooco N. KOMOW. ELECTRIC CLOTH CUTTING MACHINE.

APPLLCATION FILED MAY 3, 1912.

1 1 77,872 Patented Apr. 4, 1916.

2 SHEETS-SHEET 2- QWi/ Maooeo v 5] vwc whoa NICOLAS KOMOW, OF BROOKLYN, NEW YORK.

ELECTRIC CLOTH-CUTTIN G MACHINE.

Specification of Letters Patent.

Patented Apr. 4, 1916.

Application filed May 3, 1912. Serial No. 694,928.

To all whom it may concern:

Be it known that I, NICOLAS KoMoW, a citizen of the United States, and a resident of Brooklyn, in the borough of Brooklyn, county of Kings, State of New York, have invented certain new and useful Improvements in Electric Cloth-Cutting Machines,

of which the following is a specification.

The object of the invention is to introduce certain new and improved features of construction, relation and operation into machines of this character, and more particularly to improve the grinder, to provide simple, eflicient and convenient means for raising and lowering the same, toprovide a simple and efiicient means whereby a knife-guard is operated conjointly with the grinder, to provide a novel and desirable construction and mounting for the knifeguard, and also to 'provide an improved cloth-raiser and operating means therefor.

The invention is graphically portrayed in the accompanying drawings, which illustrate one form of embodiment of mechanism constituting a concrete expression of the fundamental inventive ideas and underlying principles. be described in detail hereinafter, the different figures of the drawings may be here briefly described.

Figure 1 is a view in side elevation of my machine'with thehandle broken away for economy of space; Fig. 2 is a View in end elevation, looking toward the position of the 'operator when using the machine; Fig. 3 is a view in side elevation of the side of the machine the reverseof that shown in Fig. 1; Fig. 4 is a fragmentary detail view of certain structural elements of the machine, more particularly the cloth-raising mechanism; Fig. 5 is a sectional detail view of the knife'and associated parts; Fig. 6 is a detail view of certain other structural elements of the machine, more particularly the grinders and their swinging support; Fig. 7 is a detail top plan view of the machinebase and of the cloth-raising mechanism;

Fig. 8 is a sectional view through the swinging support for the grinders.

Referring, now, in detail to the drawings: 1 designates the machine-base, which may be suitably shaped and proportioned, as is usual in machines of this character. The base supports an appropriate and desirable cloth-raiser. The preferred form of cloth-raiser is shown in the drawings, and

\Vhile the drawings will comprises a cloth-lifting member 2, which may be a plate, hinged at one end thereof to a foot 56, having an upper inclined or btleveled surface to guide the cloth onto the p ate 2.

Suitable mechanism is provided for actuating the cloth-lifter 2, when desired, as when cutting around corners. The preferred and desirable construction comprises certain vinstrumentalities, preferably manually operable, as follows: Rectilinearly movable and guidably supported on said base 1 is a slide 3, having, at one end, a Wedge-shaped head 3 and, at the other end, a rack 3 engaged by a pinion 4 at the lower end of a vertical, rotatable, manually operable rock-shaft 5 mounted in bearings 5, 5, in a vertical standard -6 rising from the base 1. It will thus be seen that, by rotating the rock-shaft 5 in the proper direction, the rack 3 will be moved to slide the wedge 3 beneath the cloth-lifter 2, the latter riding up on the beveled or inclined surface of the former, thus lifting the cloth upward nearer the center of the circular cloth-cutting knife 7, when it is desired to cut around corners.

The knife 7 is preferably mounted and driven as follows: A centrally apertured and threaded, stationary cone-member 48 is clamped tothe standard by a screw 10. A second internal cone-member 48 is clamped to the cone-member by a screw 11. An outer cone-member 8 encircles the cone-members 48 and 48' and in the raceway thus provided anti-friction balls 51 are disposed. The knife is clamped between the member 8 and a bevel gear 9, which is screwed thereon; and this bevel gear is driven by a bevel pinion 12 on the lower end of the armature shaft 46 of an electric motor, designated generally by the numeral 46, mounted on the upper part of the standard, and adapted to be started and stopped by the push-buttons 35 on the handle 34. The form of this motor and the relation of its parts in the cutting machine are not claimed in this application and are, therefore, not described in detail.

The invention also comprehends a knifeguard mounted in a peculiar and novel manner for adjustment, and susceptible of conjoint movement with the raising and lowering of the knife-grinders (hereinafter to be described). The knife-guard is designated by 25, and, in this instance, is provided with .a slot 26, through which projects a screw guard 25, tending to slide it forward and over'the edge of the knife 7, thereby maintaining the guard in proper position when the machine is in motion and protecting that part of the edge of the knife which is above the cloth. The means by which the guard is susceptible of conjoint movement with the lowering of the grinders will be hereinafter described in connection with the description of the grinders.

The invention comprehends the provision of a suitable adjustable gage for determining the normal position ofthe knife-guard. The gage preferably comprises a bell-crank or angular member 31, pivoted at the junction of its arms to the standard 6 by a screw 32, which can be set so as to hold the gage frictionally in any position where it may be set. The end of the upper arm of this gage is in position to be contacted by the guard 25, so as to hold it against the pressure of the spring 27 at the desired forward position. The depending arm of the gage may have a handle 33 for its convenient manipulation.

The invention comprehends, furthermore, the provision of a suitable grinder, and contemplates a novel mounting of the same whereby the grinder-disks are brought into engagement with opposite sides of the knifeedge at spaced points, when the grinder is depressed. A desirable arrangement is shown 'in the drawings, and is now described. Carried by the standard 6 is a cylindrical, horizontally-positioned member 22, in which is disposed a plug or core 55, constituting, in function, a pivot for the swinging grindercarriage, about to be described. Encircling the exteriorly projecting portion of .the plug 55 is a collar 53, forming a part of the swinging grinder-carrier; provided with a disk. 53 disposed against areduced portion or neck 55 of the core 55, and closing this end of the member 22, and with a bracket 53 provided with two screw-openings 53 53, toward each end thereof.

Bent grinder-arms 19, 20, of unequal length, are provided with angled inner or rear portions (see Fig. 6), having, each, a longitudinally-extending slot 59, 60, through each of which'passes a set-screw 61 screwed into the threaded holes 53 in the bracket 53 whereby the grinder-arms may be adjusted so as to bring them nearer to, or farther away from, each other, and, consequently, bringing the grinder-disks 18, 18 (rotatably carried at the lower end of Said arms 19, 20)

nearer to, or farther away, from each other, to suit the exigencies of the particular knife to be sharpened thereby. The grinder-disks are "disposed with their axes approximately tangential to the arc of swinging movement and are, therefore, in peripheral relation to each other, as shown, and present their peripheries to the opposite sides of the knifeedge, and, being set at unequal distances from the center about which the grinder swings, engage the knife in offset relation.

From this, it results that a much better Suitable manually-controlled mechanism is contemplated for raising and lowering the grinder-disks 18, 18 into and out of engagement with the knife. A desirable construction of such mechanism is shown in the drawings, and is now described. Projecting axially through the core 55 (see Fig. 10) is a screw 52, which has threaded engagement with the portion 53 of the bracket 53, and also with the bevel gear 16 carried on the end thereof projecting exteriorly of the cylindrical member 22. The end of the screw carries a lock-nut 17. Encircling the member 55 is a coil spring 54, one end thereof being secured to the plug 55 and the other end to the swinging grinder-carrier,as shown, to the portion 53' thereof. After the grinders 18, 18 have been lowered into engagement with the knife and the latter sharpened, the spring54 operates to return the grinders to their normal or raised position. Meshing with the gear 16 is a companion gear,15, carried at the end of a fore and aft rock-shaft 14, having (as shown in Figs. 1 and 3) a bent rear terminal, constituting a handle, disposed at a point near the main handle 34 of the machine, by which latter handle the machine is,'by the operator, guided and moved over the cloth, in the operation of cutting the same. The rock-shaft 1a may be rotatably mounted in brackets 23, 24. v r k The means by which the knife-guard 25 is susceptible of conjoint movement with the lowering of the grinder-disk 18, 18, whereby .the guard moves away from the knife edge as the grinder descends, preferably comprises a thrust-pin 28 suitably supported and guided in its movement, in this instance by passing loosely through the guide 29, said pin being pivoted at one end on the screw 19 carried by the swinging grinder-carriage, eccentrically of the axis thereof, and bearing at its front end against the guard 25; whereby,' as the grinders 18, 18 are lowered, the

thrust-pin 28 is actuated to move the guard 25 away from the knife-edge (as shown in mits the spring 27 to restore the guard, the

thrust pin 28 receding from the latter.

Having thus fully described my invention, I claim:

1. In a cloth-cutting machine, the combination wtih a base and a standard having a handle, and a rotary knife and motor carried by the standard, of a grinder mounted to swing on a transverse axis at the forward portion of the standard, a toothed gear united axially with said grinder, and mechanism for operating the grinder from a point near thehandle, including a toothed member to mesh with said gear.

2. In a cloth-cutting machine, the combination with a base and standard having a handle, and a rotary knife and motor carried by the standard, of a grinder mounted to swing on a transverse axis at the forward portion of the standard, a toothed gear united axially with said grinder, and a fore and aft operating connection having teeth meshing with said gear.

3. In a cloth-cutting machine, comprising a base and standard with arotary knife and driving means thereon, the combination of a grinder mounted to swing on a transverse axis at the forward portion of the standard and having a toothed gear united therewith, and a fore and aft rock-shaft bearing a gear at its forward end to mesh with the grindergear and a crank or finger-piece toward its rear end.

4. In a cloth-cutting machine comprising a base and standard having a rotary knife and driving means thereon, the combination of a grinder mounted to swing on a transverse axis at theforward portion of the standard, a bevel gear united axially with the grinder, operating mechanism comprising a rock-shaft at right-angles to the grinder axis, and a bevel gear on said shaft meshing with the grinder-gear.

5. In a rotary-knife cloth-cutting machine, a swinging grinder carrier having two grinding disks positioned thereon so as to present their peripheries to the opposite sides of the knife edge, said disks being set at unequal distances from the center about which the grinder carrier swings, whereby to engage the knife in oflset relation.

6. In a cloth-cutting'machine, a swinging grinder mechanism comprising an axial portion, two arms of unequal length projecting therefrom, grinder-disks on said arms in peripheral relation to each other and out of transverse alinement, and means for permitting lateral adjustment thereof.

7. In a cloth-cutting machine having a rotary knife, a grinder comprising a swinging carrier anda pair ofgrinder-disks mounted thereon in peripheral relation to each other, whereby the disk-peripheries are brought into engagement with opposite sides of the knife-edge when the grinder is depressed.

8. In a cloth-cutting machine, having arotary knife, a grinder comprising a swinging carrier and a pair of grinder-disks mountedthereon upon axes approximately tangential to the arc of movement and offset with respect to each other, whereby the disk-peripheries are brought into engagement with opposite sides of the knife-edge at spaced points when the grinder is depressed.

9. In a cloth-cutting machine, a base and a-standard having a handle, a rotary knife, and means for driving the same, in combination with a grinder mounted to swing about a transverse axis toward the front of the standard, .mechanism for operating the grinder from a point near the handle, comprising a grinder-gear and a fore and aft rockshaft having a gear meshing with the grinder-gear, a guard for the knife movable to expose the knife-edge to the grinder, and a thrust-pin between the grinder operating mechanism and the guard.

10. In a rotary-knife cloth-cutting machine, the combination of a knife-guard, a mounting for the guard whereby the latter is adapted for straight-line fore and aft movement, a grinder, and means for effect ng conjoint movement of the uard and grinder.

11. In a rotary-knife cloth-cutting machine, the combination of a knife-guard, a mounting for the guard whereby the latter is adapted for straight-line fore and aft movement, a grinder, and a thrust-connection between the grinder and the guard.

12. In a rotary-knife cloth-cutting machine, the combination of a grinder and operating mechanism, a spring for restoring said parts, a knife-guard, a thrust-pm interposed as a one-way acting connection between the grinder and operating mechanism on the one hand and the guard on the other hand, and a spring for restoring the knifeguard.

13.. In a rotary knife cloth cutting machine, a knife, a grinder for the knife, a knife-guard removable to expose the knife edge to the grinder, a gage determin ng the normal position of the guard, a spring-for urging the guard against the gage, and means for bringing the grinder into action and simultaneously moving the guard away from its gage.

14. In a rotary knife cloth cutting machine, the combination with a base and a standard, a-rotary-knife, and driving means, of a hinged cloth-raiser on the base, and a member mounted slidably on the base and adapted to adjustthe cloth-raiser by a wedging action. a 15. In a rotary knife cloth cutting machine, the combination with. a base and Ward end to the base, a Wedge, slidable fore 10 and aft on the base to adjust said clothraiser, and a vertical rock-shaft gearedto said Wedge.

NICOLAS KOMOW.

Witnesses WILLIAM L. STOUT, IsADoR FISCHER. 

